I solved the bascule bridge problems today.
A few months ago, I assembled the bascule bridge and ran some engines around the track and over the bridge. I didn't like the idea of only having 3 bridge piers on both sides of the bridge. But my track wasn't nailed down yet, so maybe that's why the engines didn't run well, and derailed over the bridge and the poorly supported incline/decline portions
But I didn't waste any time, and ordered the Atlas bridge pier kit so I could have another option
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Fast forward to this week and I have my track nailed down, and the 6 original bridge piers screwed down, and the bascule bridge still derailed my engines.
Today I removed the 3" track that was glued to the "left" side of the bridge (opposite of the tower). I replaced it with a custom length piece of track that was about 1/8" longer. I attached the new 3" piece to the bridge with nickel silver track joiners. The bridge will not open like it's designed to. In fact, it won't open at all, and it won't be wired at all. It wasn't going to raise & lower anyway, so no loss there.
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There are some small gaps between a few rails, but not enough to cause any problems. The uneven tracks on the bridge were filed smooth. There are now 7 bridge piers on each side of the bridge, which supports the track as it should. The bridge piers were nailed down using Atlas track nails, 4 nails per pier.
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Now my engines run smoothly all the way around the track, with no issues going over the bridge. The engines go clockwise and counterclockwise with no issues. The entire modification took less than 3 hours.
Next task will be to wire the inside mainline loop, and start running trains